[PATCH v6 5/8] vfio: platform: add compat in vfio_platform_device

[Eric Auger]

Let's retrieve the compatibility string on probe and store it
in the vfio_platform_device struct

Signed-off-by: Eric Auger <eric.au...@linaro.org>

---

v2 -> v3:
- populate compat after vdev check
---
 drivers/vfio/platform/vfio_platform_common.c  | 15 ++++++++-------
 drivers/vfio/platform/vfio_platform_private.h |  1 +
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/vfio/platform/vfio_platform_common.c 
b/drivers/vfio/platform/vfio_platform_common.c
index 3b7e52c..f2d41a0 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -41,16 +41,11 @@ static const struct vfio_platform_reset_combo 
reset_lookup_table[] = {
 static void vfio_platform_get_reset(struct vfio_platform_device *vdev,
                                    struct device *dev)
 {
-       const char *compat;
        int (*reset)(struct vfio_platform_device *);
-       int ret, i;
-
-       ret = device_property_read_string(dev, "compatible", &compat);
-       if (ret)
-               return;
+       int i;
 
        for (i = 0 ; i < ARRAY_SIZE(reset_lookup_table); i++) {
-               if (!strcmp(reset_lookup_table[i].compat, compat)) {
+               if (!strcmp(reset_lookup_table[i].compat, vdev->compat)) {
                        request_module(reset_lookup_table[i].module_name);
                        reset = __symbol_get(
                                reset_lookup_table[i].reset_function_name);
@@ -544,6 +539,12 @@ int vfio_platform_probe_common(struct vfio_platform_device 
*vdev,
        if (!vdev)
                return -EINVAL;
 
+       ret = device_property_read_string(dev, "compatible", &vdev->compat);
+       if (ret) {
+               pr_err("VFIO: cannot retrieve compat for %s\n", vdev->name);
+               return -EINVAL;
+       }
+
        group = iommu_group_get(dev);
        if (!group) {
                pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
diff --git a/drivers/vfio/platform/vfio_platform_private.h 
b/drivers/vfio/platform/vfio_platform_private.h
index fd262be..415310f 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -57,6 +57,7 @@ struct vfio_platform_device {
        int                             refcnt;
        struct mutex                    igate;
        struct module                   *parent_module;
+       const char                      *compat;
 
        /*
         * These fields should be filled by the bus specific binder
-- 
1.9.1

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